Java实现AES/CBC/PKCS7Padding加解密

Posted 2020-12-19 tiro996

目录

• 引入依赖
• 完整代码

最近项目需要选择一套对称加密算法，来满足前后端之间的加解密操作。初步打算前端使用crypto-js来实现，后端使用java本身的加密算法实现,但遇到了一个问题：java本身只支持NoPadding和PKCS5Padding,而crypto-js提供的padding方式没有PKCS5Padding，所以不得以，前后端最终使用PKCS7Padding来实现功能.因此只能通过引入第三方jar包的方式让jave支持pkcs7padding

引入依赖

<dependency>
			<groupId>org.bouncycastle</groupId>
			<artifactId>bcprov-jdk16</artifactId>
			<version>1.46</version>
		</dependency>

完整代码

package com.hzjd.miniapp.util;

import java.security.Security;
import java.security.spec.AlgorithmParameterSpec;

import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

import org.apache.commons.codec.binary.Base64;
import org.apache.commons.lang.StringUtils;
import org.bouncycastle.jce.provider.BouncyCastleProvider;

import com.sun.istack.internal.NotNull;

public class AESUtil {
	private static final String CHARSET_NAME = "UTF-8";
	private static final String AES_NAME = "AES";
	// 加密模式
	public static final String ALGORITHM = "AES/CBC/PKCS7Padding";
	// 密钥
	public static final String KEY = "1954682168745975";
	// 偏移量
	public static final String IV = "1954682168745975";
	static {
		Security.addProvider(new BouncyCastleProvider());
	}

	/**
	 * 加密
	 *
	 * @param content
	 * @param key
	 * @return
	 */
	public String encrypt(@NotNull String content) {
		byte[] result = null;
		try {
			Cipher cipher = Cipher.getInstance(ALGORITHM);
			SecretKeySpec keySpec = new SecretKeySpec(KEY.getBytes(CHARSET_NAME), AES_NAME);
			AlgorithmParameterSpec paramSpec = new IvParameterSpec(IV.getBytes());
			cipher.init(Cipher.ENCRYPT_MODE, keySpec, paramSpec);
			result = cipher.doFinal(content.getBytes(CHARSET_NAME));
		} catch (Exception e) {
			e.printStackTrace();
		}
		return Base64.encodeBase64String(result);
	}

	/**
	 * 解密
	 *
	 * @param content
	 * @param key
	 * @return
	 */
	public String decrypt(@NotNull String content) {
		try {
			Cipher cipher = Cipher.getInstance(ALGORITHM);
			SecretKeySpec keySpec = new SecretKeySpec(KEY.getBytes(CHARSET_NAME), AES_NAME);
			AlgorithmParameterSpec paramSpec = new IvParameterSpec(IV.getBytes());
			cipher.init(Cipher.DECRYPT_MODE, keySpec, paramSpec);
			return new String(cipher.doFinal(Base64.decodeBase64(content)), CHARSET_NAME);
		} catch (Exception e) {
			e.printStackTrace();
		}
		return StringUtils.EMPTY;
	}

	public static void main(String[] args) {
		AESUtil aes = new AESUtil();
		String contents = "121456465";
		String encrypt = aes.encrypt(contents);
		System.out.println("加密后:" + encrypt);
		String decrypt = aes.decrypt(encrypt);
		System.out.println("解密后:" + decrypt);
	}
}